At 07:26 PM 9/29/99 -0500, you wrote:
>I finally got the truck back together last weekend. I have the Hughes cam,
>hughes stage I ported heads, intake mods, Bruce and Frank stage II TB, JBA
>headers, 3" exhaust, MP computer etc. The truck is very strong from 2500 rpm
>up with the low end weaker but respectable. I'm having a problem at part
>throttle around 2000 rpm in third or fourth gear. The engine surges quite
>badly and backfires (noticeable pop) through the exhaust. My idle speed is
>normal and I have double checked for vaccum leaks. All seems ok (no check
>engine light). Any ideas?? I'm wondering if the factory injectors/pump are
>insufficient. I'm hoping someone on the list has some ideas as it is quite
>annoying to drive in this condition. Please respond asap.
>Andre Mauboussin 95 Dak
If your O2 sensor is up to scratch, then I would make sure that the cam
position sensor is doing its job properly. With Hughes' reputation,
you would like to assume that the cam was degreed properly and the timing
chain installed properly.
There are a couple of formula that can be used to see if the stock injectors
are the proper size to handle your engine's output and to determine if fuel
pressure is adequate for your application. MSD (PN 2000) has a software
program that will estimate the injector size for you. It also takes into
account supercharged applications and the effect of aftercoolers and
compressor
deficiencies. It will also output a min and max injector-size recommendation.
It might also be that the cam and mods on the intake side has exceeded the
MP PCM
built-in system's capability to adapt to your particular mods with regards to
the driveability issue.
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